Steam-turbine.



UNITED- STATESr Patenteaivray carece.

PATENT OFFICE.

JOHANN STUMPF, OF CHARLOTTENBURG, GERMANY, ASSIGNOR TO GEN- ERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

STEAM-TURBINE.

SPECIFICATION forming' -part of Letters IatentNo. 790,408, dated May 23, 1905.

Application filed September 8.1903. Serial No. 172,238.

To all whom t may concern.-

Be it known that I, JOHANN STUMPF, a sub-Y ject of the King of Prussia, German Emperor, and a resident of 27 Rankestrasse, Charlottenburg, near Berlin, Kingdom of Prussia, German Empire, have invented certaininew and useful Improvements in Steam'or Gas Turbines, of which the following is an exact specification.

My invention relates to steam or gas turbines, and more especially to a turbine with several turbine-wheels which are situated so that the steam impinging upon thefirst socalled primary turbine-wheelflowsdirectly without any fixed guide-vanes to the following secondary wheel, which rotates in a direction opposite to the direction in which the first wheel rotates. In such turbines it is a great disadvantage in case more than two turbine-` wheels with the well-known U-formed buckets are used that the buckets of the third wheel, and so on, could not be made large enough for taking up the quantity of steam which after,

passing the first buckets naturally increases considerably on account of the expansion. Therefore turbine wheels with U -formed buckets could advantageously be used if only two turbine-wheels were arranged. In'order to do away with this disadvantage, I provide my present invention, by means of which vanerims which allow an axial admission of the steam, as is the casein the well-known'Laval system, can be used. I attain this purpose by connecting all the vane-rims rotating in one direction, so as to form one wheel, and by arranging at the same time the rims rotatingin the other direction, so that a cross-section of the turbine looks like two toothed bars gear- By means of this con- Y I refer to the accompanying drawings, in

whichf Figure 1 is a view showing the invention as applied to a turbine with several turbine- 'bucket rims c' c2.

wheels rotating in opposite directions, the shafts of the-turbine-wheels being situated one within the other. Fig. 2 is a modification of the construction in which the turbinewheels are arranged upon solid shafts protruding in opposite directions. Fig. 3 is a modification of the construction shown in Fig. 1, in which modification one of the shafts carries a turbine-wheel with only one bucket-rim.

In the drawings, Fig. l, bis a hollow shaft, to which the wheel Z is fixed. a is asolid shaft situated within the hollow shaft b, to which shaft a the wheel o is fixed. The wheel d is provided with two vane or bucket'rims d d2, and the wheel c is provided with two vane or drawings that the bucket-rims of the wheel d alternate with the bucket-rims of the turbinewheel c. For this purpose the bucket-rim c2 is connected by a mantle e to the bucket-rim 0',and the bucket-rim Z2 is connected by a mantle f to the bucket-.rim CZ. It will be clear that each wheel may be provided with three or more vane-rims. It will be seen from the drawing that the left-hand rim c' is impinged upon by the fresh steam from the nozzle hand that the vanes of the rims get larger toward the right-hand side, according to the enlargement of the quantity of steam. It is hereby attained that 4the steam can be perfectly utilized.

In the modification shown in Fig. 2 the rims c' c2 are connected to the wheel c in the manner described above withregard to Fig. v1. The shaft b is provided with two separate turbine-wheels o? and g, each of which has only -one vane-rim (Z and g.

In the modification shown in Fig. 3 the shaft n carries the turbine-wheel c, which is only Avane-rims c4l and d', i

It will be seen from the,

gg y '790,408

It will be seen from the example given that the invention can be modified in different ways.

The nozzles /L are arranged to convert a certain amount of the pressure of the motive iiuid into velocity before discharging it against the vanes. I may use one or more of these nozzles, depending upon the requirements, and they may be of any suitable construction and expanding or non-expanding in character.

Having thus fully described the nature of this invention, what I desire to secure by Letters Patent of the United States is- In a steam or gas turbine, the combination of two systems of vane-rims rotating in opposite directions, the rims of one system being JOHANN STUMPF.

Witnesses HENRY HAsPE, WOLDEMAR HAUPT. 

